I can,t believe they are only anchored with a brick,they will be washed downstream with the first big flood.Especialy when they get full of weed and leaves.
Some bright spark will be getting paid good money for such a stupid idea.
As you say,why don,t they just cull some or better still all of the black pests that are roosting on the dam at Framwellgate.
Also,its not just the Cathedral and Prebends stretch that they are hammering,the last time i had a walk down the Grange stretch below Durham i counted 16 of the fkn things.......